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Old 05-29-2016, 05:34 PM
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2 CB Wiring Questions

Hey folks,

Put in my first CB this weekend, came out of it with two questions I wanted some advice on.

First, here's two photos of the wiring to my battery. It's extremely simple - wire from the radio crimped to ring connectors, with the positive having an inline fuse in between. The wires run into the body through a hole that was drilled by the PO (that had some old cut wire that was attached to the battery in it that I pulled out). They can be seen entering in the second photo Does this look fine, are there going to be any problems with this?

https://i.imgur.com/9LKGvdt.jpg
https://i.imgur.com/MWKYlCj.jpg


Second question is - after connecting everything, I powered on the radio and happily saw it working. When I turn the engine on too, though, the S/RF meter starts moving a bit - there are 4 lights measuring strength and it bounces between 2 and 3 lights, and the range that I need to turn the squelch dial for the sound to go away increases dramatically (but still has plenty of space with no noise). I assume this isn't intended... or maybe it is. But if not, what could the problem be here? I could only find a few things on google and they suggested making sure the antenna was grounded, but considering it only happens with the engine on I'm thinking maybe it more has to do with something up front instead? I made sure to shave away a lot of the paint from the antenna mount to hopefully get a good ground back there.

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Old 05-29-2016, 06:06 PM   #2
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Yes that extra noise could be caused by the antenna's mount or mounting bracket not being adequately grounded. What is your antenna's SWR?

Or it could be that someone changed your spark plugs or ignition wiring to non-resistor type products which will cause a lot of static that a CB radio will pick up. Does your TJ have a standard distributor cap with a separate ignition wire leading to each spark plug, or is there an ignition coil rail that covers all six spark plugs?

What model year is your TJ?

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Old 05-29-2016, 07:02 PM
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Thanks Jerry. Would it still be possible that the antenna mount is the issue considering it doesn't happen with the engine off? I'd think it would pull the same amount of power either way, but I am new to this radio business so I can understand if that's not the case.

2003 TJ I6. Looks like it has a rail. I still need to tune the antenna, have my SWR meter but haven't gotten a chance to drive it someplace open. I figured with the issue this prominent the tuning wouldn't change it that drastically, but let me know if tuning it actually could resolve it all.
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Old 05-29-2016, 07:05 PM   #4
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Tuning an antenna won't significantly reduce the type of noise you described. An inadequate or missing ground at the antenna mount would definitely make the antenna more likely to pick up engine noise.

The antenna mount and its mounting bracket must have a good large surface area bare metal connection to the Jeep to provide the required RF ground. A simple ground wire isn't enough to provide the RF type of ground an antenna requires.
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Old 05-29-2016, 07:22 PM
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Thanks. I'm using one of the Teraflex tail light mounts. I made sure to sand away the paint around all of the screw holes as people suggested. Though now that you mention it I might not have sanded away the hole the antenna itself screws through. I need to go check that... heh.

Beyond that, let me know if you have any other thoughts on it. I'll definitely check back in once I've looked at/resolved the aforementioned hole.
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Old 05-29-2016, 08:32 PM   #6
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Make sure the bottom of the mounting bracket has the powder coating scraped away as shown below. The bottom half of the antenna mount, called the SO-239 Coax Connector, MUST have a 360 degree bare metal to bare metal connection to the mounting bracket. And the bracket must have a bare metal connection to where it is bolted to the tub under the tail lights.

I'd rather have an aluminum or stainless steel version of Teraflex's 100% powder coated bracket which causes a lot of problems for those trying to get their CB antennas to work properly.
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